flowage vs overflow

flowage

noun
  • A flowing or overflowing of liquid. 

overflow

noun
  • The spillage resultant from overflow; excess. 

  • The situation where a value exceeds the available numeric range. 

  • Outlet for escape of excess material. 

verb
  • To flow over the edge of a container. 

  • To exceed limits or capacity. 

  • To (cause to) exceed the available numeric range. 

  • To cover with a liquid, literally or figuratively. 

  • To flow over the brim of (a container). 

  • To be superabundant; to abound. 

  • To cause an overflow. 

How often have the words flowage and overflow occurred in a corpus of books? (source: Google Ngram Viewer )